<?php

// $Id: user_from_userref.inc,v 1.1.2.3 2009/07/21 20:06:12 markuspetrux Exp $

/**
 * @file
 * Implements the user reference relationship for Panels.
 */

/**
 * Implementation of hook_ctools_relationships().
 */
function userreference_user_from_userref_ctools_relationships() {
    return array(
        'title' => t('User from reference'),
        'keyword' => 'userreference',
        'description' => t('Adds a user from a user reference in a node context; if multiple users are referenced, this will get the first referenced user only.'),
        'required context' => new ctools_context_required(t('Node'), 'node'),
        'context' => 'userreference_user_from_userref_context',
        'settings form' => 'userreference_user_from_userref_settings_form',
        'settings form validate' => 'userreference_user_from_userref_settings_form_validate',
    );
}

/**
 * Return a new ctools context based on an existing context.
 */
function userreference_user_from_userref_context($context, $conf) {
    // If unset it wants a generic, unfilled context, which is just NULL.
    if (empty($context->data)) {
        return ctools_context_create_empty('user', NULL);
    }

    // Prevent whitescreens on stale data.
    if (empty($conf)) {
        return ctools_context_create_empty('user', NULL);
    }

    if (isset($context->data->{$conf['field_name']}[0]['uid']) && ($uid = $context->data->{$conf['field_name']}[0]['uid'])) {
        if ($account = user_load(array('uid' => $uid))) {
            return ctools_context_create('user', $account);
        }
    }
}

/**
 * Settings form for the ctools relationship.
 */
function userreference_user_from_userref_settings_form($conf) {
    $options = array();
    foreach (content_fields() as $field) {
        if ($field['type'] == 'userreference') {
            $options[$field['field_name']] = t($field['widget']['label']);
        }
    }
    $form['field_name'] = array(
        '#title' => t('User reference field'),
        '#type' => 'select',
        '#options' => $options,
        '#default_value' => isset($conf['field_name']) ? $conf['field_name'] : '',
        '#prefix' => '<div class="clear-block">',
        '#suffix' => '</div>',
    );

    return $form;
}
